In workplace speech, bandwidth is capacity: “I don’t have the bandwidth this sprint” means no room for more work, borrowed from networking where bandwidth is how much data a connection can carry. It is a politer refusal than “no”, which is largely why it caught on.
Used well it makes workload visible and negotiable; used badly it dresses up chronic overload as a scheduling detail. Teams that talk about bandwidth honestly usually pair it with something that shows real commitments, so capacity is a fact rather than a feeling.